缓存之 -Redis
其实这类服务还一样, server , client 两端。。。 WIN 和 linux 均可,开源发现源码还是 C 看来 C 还是王者哦。。。后悔没深入学
Redis支持五种数据类型:string(字符串),hash(哈希),list(列表),set(集合)及zset(sorted set:有序集合)。
使用
GitHub 上 window版本的Redis-x64-3.2.100.zip 下载没网速,需要上外网,FQ下载,也可以在百度链接上下载:https://pan.baidu.com/s/1gAPPZjUnM5jTvk8eg34mRQ
提取码:nvt9
解压后目录如下:
1.redis 启动
打开一个命令窗口,进入到你解压的目录,输入命令:redis-server redis.windows.conf
2.部署redis为windows下的服务 命令如下:
再打开一个新的命令窗口,输入命令:redis-server --service-install redis.windows.conf
3.安装后的启动服务命令:redis-server --service-start
4.停止服务命令:redis-server --service-stop
redis的卸载命令:redis-server --service-uninstall
推荐一个redis的管理工具:Redis Desktop Manager
命令
redis-cli 默认连接本地 redis server
若要连接远程需要指定 host或 IP + PORT
redis-cli -h host -p port -a password
redis-cli -h 127.0.0.1 -p 6379 -a "mypass"
java 中 使用 jedis , 首先去 下好 驱动包
Jedis jedis = new Jedis("localhost");
System.out.println("连接成功");
//查看服务是否运行
System.out.println("服务正在运行: "+jedis.ping());
jedis.set("name","frank");
用命令行 检索下:
从网上搜索到 常见java --- redis 的 数据结构操作,修改了 setMaxActive , setMaxWait 为 高版本的 setMaxTotal,setMaxWaitMillis
// 本 demo 采用 当前最新版本 jedis 2.8.2
package com.utils;
import redis.clients.jedis.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.JedisShardInfo;
import redis.clients.jedis.ShardedJedis;
import redis.clients.jedis.ShardedJedisPool;
import redis.clients.jedis.SortingParams;
public class RedisClient {
private Jedis jedis; // 非分布式也即非切片客户端连接
private JedisPool jedisPool; // 非分布式也即非切片连接池
private ShardedJedis shardedJedis; // 分布式也即切片连接
private ShardedJedisPool shardedJedisPool; //切片连接池
public RedisClient() {
initialPool();
initialShardedPool();
shardedJedis = shardedJedisPool.getResource();
jedis = jedisPool.getResource();
}
public static void main(String [] args){
System.out.println("开始测试......");
new RedisClient().show();
System.out.println("测试完成......");
}
/*
* 初始化非切片池
*/
private void initialPool(){
//池基本配置
JedisPoolConfig config = new JedisPoolConfig();
config.setMaxTotal(20);
config.setMaxIdle(5);
config.setMaxWaitMillis(1000L);
config.setTestOnBorrow(false);
jedisPool = new JedisPool(config,"127.0.0.1",6379);
}
/*
* 初始化切片池
*/
private void initialShardedPool(){
//池基本配置
JedisPoolConfig config = new JedisPoolConfig();
config.setMaxTotal(20);
config.setMaxIdle(5);
config.setMaxWaitMillis(1000L);
config.setTestOnBorrow(false);
//slave连接
List<JedisShardInfo> shards = new ArrayList<JedisShardInfo>();
shards.add(new JedisShardInfo("127.0.0.1", 6379, "master"));
//构造池
shardedJedisPool = new ShardedJedisPool(config, shards);
}
public void show(){
KeyOperate();
StringOperate();
ListOperate();
SetOperate();
SortedSetOperate();
HashOperate();
}
//功能代码模块
/*
* key功能
*/
private void KeyOperate() {
System.out.println();
System.out.println("Key 功能 : ");
//清空库中所有数据
System.out.println("清空库中所有数据: "+jedis.flushDB());
//新增 key001,value001键值对
System.out.println("新增 key001,value001键值对: "+shardedJedis.set("key001", "value001"));
System.out.println("新增 key002,value002键值对: "+shardedJedis.set("key002", "value002"));
//判断key001是否存在
System.out.println("判断key001是否存在: "+shardedJedis.exists("key001"));
//输出系统中所有的key
System.out.println("输出系统中所有的key:");
Set<String> keys = jedis.keys("*");
Iterator<String> iterator = keys.iterator();
while(iterator.hasNext()){
String key = iterator.next();
System.out.println(key);
}
//结果为key001 key002
//删除某个key,若key不存在这忽略命令
System.out.println("删除某个key,若key不存在这忽略命令: "+jedis.del("key002"));;
System.out.println("判断key002是否存在: "+jedis.exists("key002")); //判断key002是否存在
//设置key001的过期时间
System.out.println("设置key001的过期时间: "+jedis.expire("key001", 5));
try {
Thread.sleep(2000); //睡眠2秒
} catch (Exception e) {
}
//返回某个key的剩余有效时间,单位为”秒“,不存在的或者永远有效的都返回-1
System.out.println("返回某个key001的剩余有效时间: "+jedis.ttl("key001"));
//设置某个key的生存时间
System.out.println("设置某个key001的生存时间: "+jedis.persist("key001"));
//查看key所存放值的类型
System.out.println(""+jedis.type("key001"));
//修改key的名称
System.out.println("重命名key001: "+jedis.rename("key001", "key01"));
//将当前db中的key移动到指定的db当中
System.out.println("将当前db中的key移动到指定的db当中: "+jedis.move("key01", 3));
/*
* 运行结果
*
清空库中所有数据:OK
判断key999键是否存在:false
新增key001,value001键值对:OK
判断key001是否存在:true
新增key002,value002键值对:OK
系统中所有键如下:
key002
key001
系统中删除key002: 1
判断key002是否存在:false
设置 key001的过期时间为5秒:1
查看key001的剩余生存时间:3
移除key001的生存时间:1
查看key001的剩余生存时间:-1
查看key所储存的值的类型:string
*
*/
}
private void StringOperate() {
System.out.println();
System.out.println("String 功能 :");
// 清空数据
System.out.println("清空库中所有数据:"+jedis.flushDB());
System.out.println("=============增=============");
jedis.set("key001","value001");
jedis.set("key002","value002");
jedis.set("key003","value003");
System.out.println("已新增的3个键值对如下:");
System.out.println(jedis.get("key001"));
System.out.println(jedis.get("key002"));
System.out.println(jedis.get("key003"));
System.out.println("=============删=============");
System.out.println("删除key003键值对:"+jedis.del("key003"));
System.out.println("获取key003键对应的值:"+jedis.get("key003"));
System.out.println("=============改=============");
//1、直接覆盖原来的数据
System.out.println("直接覆盖key001原来的数据:"+jedis.set("key001","value001-update"));
System.out.println("获取key001对应的新值:"+jedis.get("key001"));
//2、直接覆盖原来的数据
System.out.println("在key002原来值后面追加:"+jedis.append("key002","+appendString"));
System.out.println("获取key002对应的新值"+jedis.get("key002"));
System.out.println("=============增,删,查(多个)=============");
/**
* mset,mget同时新增,修改,查询多个键值对
* 等价于:
* jedis.set("name","ssss");
* jedis.set("jarorwar","xxxx");
*/
System.out.println("一次性新增key201,key202,key203,key204及其对应值:"+jedis.mset("key201","value201",
"key202","value202","key203","value203","key204","value204"));
System.out.println("一次性获取key201,key202,key203,key204各自对应的值:"+
jedis.mget("key201","key202","key203","key204"));
System.out.println("一次性删除key201,key202:"+jedis.del(new String[]{"key201", "key202"}));
System.out.println("一次性获取key201,key202,key203,key204各自对应的值:"+
jedis.mget("key201","key202","key203","key204"));
System.out.println();
//jedis具备的功能shardedJedis中也可直接使用,下面测试一些前面没用过的方法
System.out.println("======================String_2==========================");
// 清空数据
System.out.println("清空库中所有数据:"+jedis.flushDB());
System.out.println("=============新增键值对时防止覆盖原先值=============");
System.out.println("原先key301不存在时,新增key301:"+shardedJedis.setnx("key301", "value301"));
System.out.println("原先key302不存在时,新增key302:"+shardedJedis.setnx("key302", "value302"));
System.out.println("当key302存在时,尝试新增key302:"+shardedJedis.setnx("key302", "value302_new"));
System.out.println("获取key301对应的值:"+shardedJedis.get("key301"));
System.out.println("获取key302对应的值:"+shardedJedis.get("key302"));
System.out.println("=============超过有效期键值对被删除=============");
// 设置key的有效期,并存储数据
System.out.println("新增key303,并指定过期时间为2秒"+shardedJedis.setex("key303", 2, "key303-2second"));
System.out.println("获取key303对应的值:"+shardedJedis.get("key303"));
try{
Thread.sleep(3000);
}
catch (InterruptedException e){
}
System.out.println("3秒之后,获取key303对应的值:"+shardedJedis.get("key303"));
System.out.println("=============获取原值,更新为新值一步完成=============");
System.out.println("key302原值:"+shardedJedis.getSet("key302", "value302-after-getset"));
System.out.println("key302新值:"+shardedJedis.get("key302"));
System.out.println("=============获取子串=============");
System.out.println("获取key302对应值中的子串:"+shardedJedis.getrange("key302", 5, 7));
}
private void ListOperate() {
System.out.println();
System.out.println("list 功能 :");
// 清空数据
System.out.println("清空库中所有数据:"+jedis.flushDB());
System.out.println("=============增=============");
shardedJedis.lpush("stringlists", "vector");
shardedJedis.lpush("stringlists", "ArrayList");
shardedJedis.lpush("stringlists", "vector");
shardedJedis.lpush("stringlists", "vector");
shardedJedis.lpush("stringlists", "LinkedList");
shardedJedis.lpush("stringlists", "MapList");
shardedJedis.lpush("stringlists", "SerialList");
shardedJedis.lpush("stringlists", "HashList");
shardedJedis.lpush("numberlists", "3");
shardedJedis.lpush("numberlists", "1");
shardedJedis.lpush("numberlists", "5");
shardedJedis.lpush("numberlists", "2");
System.out.println("所有元素-stringlists:"+shardedJedis.lrange("stringlists", 0, -1));
System.out.println("所有元素-numberlists:"+shardedJedis.lrange("numberlists", 0, -1));
System.out.println("=============删=============");
// 删除列表指定的值 ,第二个参数为删除的个数(有重复时),后add进去的值先被删,类似于出栈
System.out.println("成功删除指定元素个数-stringlists:"+shardedJedis.lrem("stringlists", 2, "vector"));
System.out.println("删除指定元素之后-stringlists:"+shardedJedis.lrange("stringlists", 0, -1));
// 删除区间以外的数据
System.out.println("删除下标0-3区间之外的元素:"+shardedJedis.ltrim("stringlists", 0, 3));
System.out.println("删除指定区间之外元素后-stringlists:"+shardedJedis.lrange("stringlists", 0, -1));
// 列表元素出栈
System.out.println("出栈元素:"+shardedJedis.lpop("stringlists"));
System.out.println("元素出栈后-stringlists:"+shardedJedis.lrange("stringlists", 0, -1));
System.out.println("=============改=============");
// 修改列表中指定下标的值
shardedJedis.lset("stringlists", 0, "hello list!");
System.out.println("下标为0的值修改后-stringlists:"+shardedJedis.lrange("stringlists", 0, -1));
System.out.println("=============查=============");
// 数组长度
System.out.println("长度-stringlists:"+shardedJedis.llen("stringlists"));
System.out.println("长度-numberlists:"+shardedJedis.llen("numberlists"));
// 排序
/*
* list中存字符串时必须指定参数为alpha,如果不使用SortingParams,而是直接使用sort("list"),
* 会出现"ERR One or more scores can't be converted into double"
*/
SortingParams sortingParameters = new SortingParams();
sortingParameters.alpha();
sortingParameters.limit(0, 3);
System.out.println("返回排序后的结果-stringlists:"+shardedJedis.sort("stringlists",sortingParameters));
System.out.println("返回排序后的结果-numberlists:"+shardedJedis.sort("numberlists"));
// 子串: start为元素下标,end也为元素下标;-1代表倒数一个元素,-2代表倒数第二个元素
System.out.println("子串-第二个开始到结束:"+shardedJedis.lrange("stringlists", 1, -1));
// 获取列表指定下标的值
System.out.println("获取下标为2的元素:"+shardedJedis.lindex("stringlists", 2)+"\n");
}
private void SetOperate() {
System.out.println();
System.out.println("set 功能 :");
// 清空数据
System.out.println("清空库中所有数据:"+jedis.flushDB());
System.out.println("=============增=============");
System.out.println("向sets集合中加入元素element001:"+jedis.sadd("sets", "element001"));
System.out.println("向sets集合中加入元素element002:"+jedis.sadd("sets", "element002"));
System.out.println("向sets集合中加入元素element003:"+jedis.sadd("sets", "element003"));
System.out.println("向sets集合中加入元素element004:"+jedis.sadd("sets", "element004"));
System.out.println("查看sets集合中的所有元素:"+jedis.smembers("sets"));
System.out.println();
System.out.println("=============删=============");
System.out.println("集合sets中删除元素element003:"+jedis.srem("sets", "element003"));
System.out.println("查看sets集合中的所有元素:"+jedis.smembers("sets"));
/*System.out.println("sets集合中任意位置的元素出栈:"+jedis.spop("sets"));//注:出栈元素位置居然不定?--无实际意义
System.out.println("查看sets集合中的所有元素:"+jedis.smembers("sets"));*/
System.out.println();
System.out.println("=============改=============");
System.out.println();
System.out.println("=============查=============");
System.out.println("判断element001是否在集合sets中:"+jedis.sismember("sets", "element001"));
System.out.println("循环查询获取sets中的每个元素:");
Set<String> set = jedis.smembers("sets");
Iterator<String> it=set.iterator() ;
while(it.hasNext()){
Object obj=it.next();
System.out.println(obj);
}
System.out.println();
System.out.println("=============集合运算=============");
System.out.println("sets1中添加元素element001:"+jedis.sadd("sets1", "element001"));
System.out.println("sets1中添加元素element002:"+jedis.sadd("sets1", "element002"));
System.out.println("sets1中添加元素element003:"+jedis.sadd("sets1", "element003"));
System.out.println("sets1中添加元素element002:"+jedis.sadd("sets2", "element002"));
System.out.println("sets1中添加元素element003:"+jedis.sadd("sets2", "element003"));
System.out.println("sets1中添加元素element004:"+jedis.sadd("sets2", "element004"));
System.out.println("查看sets1集合中的所有元素:"+jedis.smembers("sets1"));
System.out.println("查看sets2集合中的所有元素:"+jedis.smembers("sets2"));
System.out.println("sets1和sets2交集:"+jedis.sinter("sets1", "sets2"));
System.out.println("sets1和sets2并集:"+jedis.sunion("sets1", "sets2"));
System.out.println("sets1和sets2差集:"+jedis.sdiff("sets1", "sets2"));//差集:set1中有,set2中没有的元素
}
private void SortedSetOperate()
{
System.out.println();
System.out.println("zset 功能 :");
// 清空数据
System.out.println(jedis.flushDB());
System.out.println("=============增=============");
System.out.println("zset中添加元素element001:"+shardedJedis.zadd("zset", 7.0, "element001"));
System.out.println("zset中添加元素element002:"+shardedJedis.zadd("zset", 8.0, "element002"));
System.out.println("zset中添加元素element003:"+shardedJedis.zadd("zset", 2.0, "element003"));
System.out.println("zset中添加元素element004:"+shardedJedis.zadd("zset", 3.0, "element004"));
System.out.println("zset集合中的所有元素:"+shardedJedis.zrange("zset", 0, -1));//按照权重值排序
System.out.println();
System.out.println("=============删=============");
System.out.println("zset中删除元素element002:"+shardedJedis.zrem("zset", "element002"));
System.out.println("zset集合中的所有元素:"+shardedJedis.zrange("zset", 0, -1));
System.out.println();
System.out.println("=============改=============");
System.out.println();
System.out.println("=============查=============");
System.out.println("统计zset集合中的元素中个数:"+shardedJedis.zcard("zset"));
System.out.println("统计zset集合中权重某个范围内(1.0——5.0),元素的个数:"+shardedJedis.zcount("zset", 1.0, 5.0));
System.out.println("查看zset集合中element004的权重:"+shardedJedis.zscore("zset", "element004"));
System.out.println("查看下标1到2范围内的元素值:"+shardedJedis.zrange("zset", 1, 2));
}
private void HashOperate()
{
System.out.println();
System.out.println("hash 功能 :");
//清空数据
System.out.println(jedis.flushDB());
System.out.println("=============增=============");
System.out.println("hashs中添加key001和value001键值对:"+shardedJedis.hset("hashs", "key001", "value001"));
System.out.println("hashs中添加key002和value002键值对:"+shardedJedis.hset("hashs", "key002", "value002"));
System.out.println("hashs中添加key003和value003键值对:"+shardedJedis.hset("hashs", "key003", "value003"));
System.out.println("新增key004和4的整型键值对:"+shardedJedis.hincrBy("hashs", "key004", 4l));
System.out.println("hashs中的所有值:"+shardedJedis.hvals("hashs"));
System.out.println();
System.out.println("=============删=============");
System.out.println("hashs中删除key002键值对:"+shardedJedis.hdel("hashs", "key002"));
System.out.println("hashs中的所有值:"+shardedJedis.hvals("hashs"));
System.out.println();
System.out.println("=============改=============");
System.out.println("key004整型键值的值增加100:"+shardedJedis.hincrBy("hashs", "key004", 100l));
System.out.println("hashs中的所有值:"+shardedJedis.hvals("hashs"));
System.out.println();
System.out.println("=============查=============");
System.out.println("判断key003是否存在:"+shardedJedis.hexists("hashs", "key003"));
System.out.println("获取key004对应的值:"+shardedJedis.hget("hashs", "key004"));
System.out.println("批量获取key001和key003对应的值:"+shardedJedis.hmget("hashs", "key001", "key003"));
System.out.println("获取hashs中所有的key:"+shardedJedis.hkeys("hashs"));
System.out.println("获取hashs中所有的value:"+shardedJedis.hvals("hashs"));
System.out.println();
}
}
如果有来生,一个人去远行,看不同的风景,感受生命的活力。。。